Answer:
The Great Heathen Army,[a] also known as the Viking Great Army,[1] was a coalition of Scandinavian warriors who invaded England in AD 865. Since the late 8th century, the Vikings[b] had been engaging in raids on centres of wealth, such as monasteries. The Great Heathen Army was much larger and aimed to conquer and occupy the four kingdoms of East Anglia, Northumbria, Mercia and Wessex.
The name Great Heathen Army is derived from the Anglo-Saxon Chronicle. The force was led by three of the five sons of the semi-legendary Ragnar Lodbrok, including Halfdan Ragnarsson, Ivar the Boneless and Ubba.[c] The campaign of invasion and conquest against the Anglo-Saxon kingdoms lasted 14 years. Surviving sources give no firm indication of its numbers, but it was described as amongst the largest forces of its kind.
Step-by-step explanation: